Hand brake operating mechanism



Dec. 31, 1935. P. B. CAMP HAND BRAKE OPERATING MECHANISM Filed Aug. 9, 1954 2 Sheets-Sheet l Dec. 31, 1935. B cA 2,026,268

HAND BRAKE OPERATING MECHANISM Filed Aug. 9, 1934 2 Sheets-Sheet 2 I l SQ; \W t 6 I E \\\&

Patented Dec. 31, 1935 UNITED STATES PATENT OFFICE HAND BRAKE OPERATING MECHANISM Percy B. Camp, Maywood, 111., assignor to Universal Draft Gear Attachment 00., a corporation of Illinois The invention relates to that type of hand brake operating mechanism in which the chain is wound about a drum having a horizontal axis, the drum being turned by power multiplying mechanism manually operated.

Controlling mechanism of this type is usually attached to the end wall of the car, and necessarily the extent to which it may project beyond this wall is quite limited. The mechanism is ordinarily enclosed within a housing, the winding drum being mounted on a shaft carried by the front and rear walls thereof. For the purpose of limiting the length of the drum it has heretofore been proposed to complete the winding operation in a single turn. This, however, necessarily requires the use of a drum of considerable diameter, and increases the necessary rotative movement of the hand wheel in securing adequate braking power.

The principal object of the present invention 0 is to provide adequate winding space on the drum face for two turns of the chain, notwithstanding the limited space available. Other objects are pointed out in the following description.

A simple and eflicient embodiment of the invention is hereinafter described, and is illustrated in the accompanying drawings, in which Fig. l is a longitudinal vertical central transverse section of the gear-actuating mechanism in release position;

Fig. 2 is a detail section on the line 22 of Fig. 1;

Fig. 3 is a detail section on the line 3-3 of Fig. 2;

Fig. 4 is a detail in perspecti e of the winding drum and its actuating gear;

Fig. 5 is a detail similar to Fig. 2, showing a modified form of construction; and

Fig. 6 is a detail on the line 6-6 of Fig. 5.

The actuating mechanism of the gear is inclosed in a housing comprising a back or wall plate l0, and an outstanding cover plate I I, these plates being suitably secured together and to the end wall of a car. in the brake art, and its details will vary to correspond with the mechanism which it is to inclose.

In the present instance the improved winding drum and its actuating gear are associated with a pinion l2, mounted on a shaft journaled in the front and rear walls of the housing, and projecting beyond the former and carrying the usual hand wheel l3. A holding ratchet I4 is shown as mounted with the pinion, and pawl controlling mechanism is indicated at l5. These parts being of known construction and not being necessarily This housing is generally used of the specific form illustrated, for the purposes of the present invention, are not described in detail.

The winding drum I6 is mounted upon a shaft l1, carried by the front and rear walls of the 5 housing, and here shown as being non-rotative; and the actuating gear l8, which is driven by the pinion I2, is preferably cast integral with the drum, as plainly indicated in Figs. 1 and 3.

The gear I8 is of the disc type, and is located 10 at the extreme inner end of the drum l6, and at its outer margin is provided with an instanding flange, as shown at l9, which overhangs the drum, the gear teeth being formed on this flange and the outer margin of the disc. The outer face of 15 the gear is spaced a suflicient distance from the back plate I 0 of the housing to limit the frictional engagement to the face of a short hub 20 on the inner end of the drum, and an instanding boss 2| formed on the plate I0. 20

To provide for the attachment of the brake chain 22 to the gear, a pocket 23 is formed on the inner face of the web of the gear by providing a flange 24 which is joined radially with the web, and extends outwardly to the plane of the margin 25 of the tooth-carrying flange l9, and thence backwardly a short distance in that plane. This flange 24 is slotted transversely, that is to say, from its outer to its inner margin, as shown at 25, and the web of the gear is slotted, as shown 30 at 26, in line with the slot 25. The flange 24 is strengthened by an approximately radial rib 21, having an aperture 28 to receive a cotter pin 29, which prevents the accidental dislodgement of a chain link housed within the pocket 23. 35

The rib 21 is braced by an inwardly deflected section of the web of the gear, as shown at 30. The outer end of the drum l6 bears against a boss 3|, formed on the inner face of the front plate u of the housing.

The described mechanism is designed for use in connection with the flat link type of brake chain illustrated, and which is commonly used in brake mechanism. This chain is secured to the drum gear by having its end link 32 seated within the 45 pocket 23, the second link 33 extending through the slot 25 and fitting within the slot 26 in the web of the gear. The cotter pin 29, inserted through the aperture 28 in the rib 21, extends back of the link 32, and prevents accidental displacement thereof from the pocket 23.

The slots 25 and 26 are located a suflicient distance from the axis of the gear to provide for a quick take-up of the chain slack. The first turn of the chain is about the inner end of the 55 drum, and at the completion of this turn, the chain is deflected, if necessary, by the incline 30, to prevent overlapping of the chain upon itself.

By locating the web of the gear in the plane of the outer margin of its face, ample space is provided for two turns of the chain about the drum without overlapping. Space for the second turn of the chain about the drum is provided without encroachment upon the hand wheel, by the formation of an outstanding boss 34 on the front wall II of the housing, the depending portion of the chain being slightly deflected inwardly.

Figs. and 6 illustrate a modified form of means for attaching the chain to the gear, a pair of socketed ears 35, 36 being formed on the inner face of the web of the gear between which the first link 31 of the chain may be secured by a pin 38. The pin 38 is located on a chord of the gear normal to the line of stress as the chain is wound upon the drum. To avoid the practical shortening the drum face of the gear disc may be recessed, or, as shown at 39, slotted between the ears 35, 36, to receive the link 31.

' Details of the structure may be varied within the scope of the appended claims.

I claim as my invention- 1. In a combined gear and brake chain drum, a gear wheel having a toothed perimeter united at one of its margins with the web of the wheel and a hub extending from the inner face of the web as a winding drum, and means formed integrally with the inner face of the web for securingthe first link of a brake chain within the plane of the free margin of the perimeter of the wheel, the web being apertured to provide clearance for a portion of the first link of the chain having the plane of its perimeter at an angle to the web.

2. In a combined winding drum and gear, a disc having one plane face and a gear toothed flange projecting from the outer margin of its opposite face, a hub constituting a winding drum projecting integrally from the flanged face, the disc being provided with a pocket on its flanged face for receiving the end link of a chain, the wall of this pocket being slotted to accommodate the second link of the chain.

3. In a combined winding drum and gear, a disc having one plane face and a. gear toothed flange projecting from the outer margin of its opposite face, a hub constituting a winding drum projecting integrally from the flanged face, the disc being provided with a pocket on its flanged face for receiving the end link of a chain, the

wall of this pocket and of the disc being slotted 5 to accommodate the second link of the chain.

4. In a combined winding drum and gear, a disc having one plane face and a gear toothed flange projecting from the outer margin of its opposite face, a hub constituting a winding drum projecting integrally from the flanged face, the disc being provided with a pocket on its flanged face for receiving the end link of a chain, the wall of this pocket being slotted to accommodate the second link of the chain, and the face of the disc having a deflecting incline leading up to the pocket.

5. In a combined gear and brake chain drum,

a gear wheel having a. toothed perimeter united at one of its margins with the web of the wheel, a hub extending from the inner face of the web as a winding drum, the web being slotted to receive a link of the chain, and means carried by the web for securing the link within the slot.

6. In a combined gear and brake chain drum, a disc wheel having a toothed perimeter united at one of its margins with the disc, a hub extending from the inner face of the disc as a winding drum, the disc being slotted to receive a link of the chain, a pair of perforated ears being formed on the inner face of the disc and flanking the slot, and a pin for securing a chain link between the ears.

'7. In a combined gear and brake chain drum,

a disc wheel having a toothed perimeter united with the disc, a hub extending from the inner facing of the disc as a winding drum, the disc being slotted to receive a link of the chain, a pair of perforated ears being formed on the inner face of the disc and flanking the slot, and 40 a pin for securing a chain link between the ears.

8. In a, combined gear and brake chain drum,

a disc wheel having an approximately flat radial face and a toothed perimeter united at one of its margins with the disc,. a hub extending from the inner face of the disc as a winding drum, the disc being slotted to receive a. link of the chain, and means for securing the link to the inner face of the web and within the slot.

PERCY B. CAW. 

